Telos NX12 user manual Desktop Director Termination Removal, Desktop Director Cable

20  Section 2

To connect two Desktop Directors to one port, a power supply and RJ-45 modular splitter is required.

One of the Directors must have its termination removed. This unterminated Director must be within 33 feet (10 meters) of the power supply.

Desktop Director Termination Removal

Desktop Directors are shipped with the internal termination resistors enabled. When two Directors are used in a single port, the termination on the Director closer to the power supply will need to be disabled. To do so, follow these steps:

1.Disconnect the Desktop Director from the Nx12.

2.Remove the handset and turn over the Director so you can see the bottom of the unit.

3. Remove the round black cover. This can be pried off with a knife blade. Or a miniature screwdriver may be pushed firmly under the lip and then lifted out to pop the cap loose.

4.You will see a black rectangular transformer labeled T1. To the right of T1 locate and remove the jumpers labeled JP1 & JP2. These are small jumper blocks, which can be lifted off with needle-nose pliers.

5.You’ll want to save the jumper blocks. You can store each of them on one of the jumper pins.

6.Replace the access cover removed in step 3 by pushing it firmly in place.

7.Reconnect the Desktop Director cable.

8.Check for proper operation

Desktop Director Cable

Each Desktop Director is supplied with a 25-foot cable. If you need another length, you can make your own cable. The Director connection is electrically identical to the ISDN S-interface, so the wiring scheme is the same. A straight-through (not crossover) cable is used between the Nx12 and the Director. TIA 568A or 568B standard Category 5/5e cables may be used. Category 3 cable is acceptable for this wiring. But since category 5e is so common and low-cost, we recommend that you use it instead.